package main
import "testing"
var gbuf []byte
var gi int
func BenchmarkCopy1(b *testing.B) {
b.ReportAllocs()
for i := 0; i < b.N; i++ {
m := make(map[string]int, 5)
for i := 0; i < 5; i++ {
m["100"] = i
}
for key := range m {
copyIface1(key, key)
}
}
}
func BenchmarkCopy2(b *testing.B) {
b.ReportAllocs()
for i := 0; i < b.N; i++ {
m := make(map[string]int, 5)
for i := 0; i < 5; i++ {
m["100"] = i
}
for key := range m {
copyIface2(key, key)
}
}
}
func copyIface1(a ...interface{}) {
if gi > 0 {
copy(gbuf, a[0].(string))
copy(gbuf, a[1].(string))
}
}
func copyIface2(a interface{}, b interface{}) {
if gi > 0 {
copy(gbuf, a.(string))
copy(gbuf, b.(string))
}
}
BenchmarkCopy1-4 3000000 452 ns/op 32 B/op 2
allocs/op
BenchmarkCopy2-4 5000000 323 ns/op 0 B/op 0
allocs/op
BenchmarkCopy1 key escapes to heap
BenchmarkCopy2 key does not escape
why ???
--
You received this message because you are subscribed to the Google Groups
"golang-nuts" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to golang-nuts+unsubscr...@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.
